fuel pump wont run on 2004 Buick Rendezvous

car shut off replaced fuel pump still wont start checked all fuses and still wont start after replacing the pump we we jumped the old pump and it did run what else could it be not letting the pump work

Asked by for the 2004 Buick Rendezvous
Fuel pump relay or connection probs at the new fuel pump that may have been original prob. Did you diag before replacing pump or was it a guess?